"Wait, what? No way, I'm ginger!"
I've seen a few Lego Doctor Who animations in my time, but none of them can quite compare to this.
Your animation is good, and while a few shots could you a little more easing-in/out it wasn't that noticeable.
Regarding the voice acting, you're a pretty good voice actor, and The Doctor is done pretty well.
But the alien with the Nute Gunray head could have had a better mic.
Set-wise, the Tardis is incredibly detailed. Everything from the green central column, to the clear SNOT floor is great.
And I'm sure that you had "fun" animating on that. The Alien ship is of about the same quality, but that kinda made the exterior set felt plain and boring in comparison. By the way, the Tardis defense blast was probably one of the weaker effects, but all the others were really good.
IMHO, Abby's name is a little too close to Amy. That would be fine, but since Amy's the second most recent companion at this time, that's probably a bit too similar of a name a bit too soon after she left. But I don't know much about Abby, so I'll save my opinion until the next part. She did manage utter one of the more awkward lines, (Doctor Who?) but generally she seemed OK. And I'm looking forward to seeing her interaction with The Doctor later on.
The intro raises a bunch of questions that I hope will be answered, but the bottom line is that I was very impressed.
Good job. Can't wait for Part 2. (When is that coming by the way?)